So sorry if this is a dumb question: I just bought a telemetry cable to connect my X8R receiver to my Pixhawk 2.1. I have one end of the cable plugged into TELEM2 on the Pixhawk, and the other end plugged into the Smart Port on the X8R. HOWEVER, the latter end only has two of three wires populated: yellow (signal) and black (- or ground). The red wire for + (power) is missing,. Is this intentional, or was I sent the wrong cable? If the cable is correct, do I need a female-to-female 3-wire servo cable to connect SBUS on X8R to RC IN on Pixhawk?